{"product_id":"altair-colourpro-ultra-3nm-hso-narrowband-filter-set-2-certified","title":"Altair ColourPRO ULTRA 3nm HSO Narrowband Filter SET 2\" CERTIFIED","description":"\u003cdiv class=\"qMYqUG_convSearchResultHighlightRoot\"\u003e\n\u003cdiv class=\"\" data-turn-id-container=\"a8efbe8a-5870-44a6-bdca-e572710ea8e1\" data-is-intersecting=\"true\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"a8efbe8a-5870-44a6-bdca-e572710ea8e1\" data-turn-id-container=\"a8efbe8a-5870-44a6-bdca-e572710ea8e1\" data-testid=\"conversation-turn-62\" data-scroll-anchor=\"false\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv data-conversation-screenshot-content=\"\" class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"1a3ef2cf-023b-4430-a9dd-841936107ae7\" data-turn-start-message=\"true\" dir=\"auto\" data-message-model-slug=\"gpt-5-2-thinking\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full dark markdown-new-styling\"\u003e\n\u003ch2 data-section-id=\"1ls5eqv\" data-start=\"0\" data-end=\"72\" style=\"text-align: center;\"\u003eAltair ColourPRO ULTRA\u003c\/h2\u003e\n\u003ch2 data-section-id=\"1ls5eqv\" data-start=\"0\" data-end=\"72\" style=\"text-align: center;\"\u003e3nm HSO Narrowband Filter Set (2\") — Certified\u003c\/h2\u003e\n\u003cp data-start=\"74\" data-end=\"495\"\u003eThis is the “go image in the city anyway” narrowband set. The \u003cstrong data-start=\"136\" data-end=\"170\"\u003eAltair ColourPRO ULTRA 3nm HSO\u003c\/strong\u003e kit gives you ultra-tight \u003cstrong data-start=\"197\" data-end=\"204\"\u003e3nm\u003c\/strong\u003e bandpasses for maximum contrast on emission nebulae, plus aggressive out-of-band blocking and halo suppression coatings so bright stars behave. And Altair doesn’t just tell you it’s in spec—\u003cstrong data-start=\"395\" data-end=\"454\"\u003eeach filter includes its own spectrographic test report\u003c\/strong\u003e so you know exactly what you’re getting.\u003c\/p\u003e\n\u003cul data-start=\"497\" data-end=\"1974\"\u003e\n\u003cli data-section-id=\"71e9nz\" data-start=\"497\" data-end=\"569\"\u003eComplete \u003cstrong data-start=\"508\" data-end=\"528\"\u003eHSO 3-filter set\u003c\/strong\u003e in \u003cstrong data-start=\"532\" data-end=\"538\"\u003e2\"\u003c\/strong\u003e at a discounted bundle price\u003c\/li\u003e\n\u003cli data-section-id=\"gyce07\" data-start=\"570\" data-end=\"647\"\u003eBuilt for \u003cstrong data-start=\"582\" data-end=\"595\"\u003emono CMOS\u003c\/strong\u003e nebula imaging (strong light-pollution rejection)\u003c\/li\u003e\n\u003cli data-section-id=\"k54ku2\" data-start=\"648\" data-end=\"765\"\u003e\n\u003cstrong data-start=\"650\" data-end=\"676\"\u003eIndividually certified\u003c\/strong\u003e: each filter includes a \u003cstrong data-start=\"701\" data-end=\"742\"\u003ehigh-resolution spectrographic report\u003c\/strong\u003e confirming tolerance\u003c\/li\u003e\n\u003cli data-section-id=\"lu0k3b\" data-start=\"766\" data-end=\"867\"\u003e\n\u003cstrong data-start=\"768\" data-end=\"780\"\u003e3nm FWHM\u003c\/strong\u003e for higher contrast than wider 6nm filters—especially in heavy urban light pollution\u003c\/li\u003e\n\u003cli data-section-id=\"51baxt\" data-start=\"868\" data-end=\"1160\"\u003eDesigned to suppress common artificial lighting emissions (Hg\/Na) and natural skyglow\n\u003cul data-start=\"960\" data-end=\"1160\"\u003e\n\u003cli data-section-id=\"119geys\" data-start=\"960\" data-end=\"1009\"\u003eAlso blocks LED lighting outside the bandpass\u003c\/li\u003e\n\u003cli data-section-id=\"80oqv1\" data-start=\"1012\" data-end=\"1160\"\u003eUsers report viable imaging even in extremely bright skies (up to Bortle 9) and sometimes slightly outside astronomical darkness (within reason)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"s6xlnr\" data-start=\"1161\" data-end=\"1261\"\u003e\n\u003cstrong data-start=\"1163\" data-end=\"1185\"\u003eOD7-class blocking\u003c\/strong\u003e (average between \u003cstrong data-start=\"1203\" data-end=\"1217\"\u003e200–1100nm\u003c\/strong\u003e) for ultra-high contrast on faint targets\u003c\/li\u003e\n\u003cli data-section-id=\"1srufvb\" data-start=\"1262\" data-end=\"1338\"\u003e\n\u003cstrong data-start=\"1264\" data-end=\"1282\"\u003eUV\/IR blocking\u003c\/strong\u003e helps keep stars tighter (reduces refractor bloating)\u003c\/li\u003e\n\u003cli data-section-id=\"111uyy6\" data-start=\"1339\" data-end=\"1578\"\u003e\n\u003cstrong data-start=\"1341\" data-end=\"1385\"\u003eV3R anti-reflection \/ anti-halo coatings\u003c\/strong\u003e\n\u003cul data-start=\"1390\" data-end=\"1578\"\u003e\n\u003cli data-section-id=\"1q2arsk\" data-start=\"1390\" data-end=\"1450\"\u003eStrong halo suppression and reduced internal reflections\u003c\/li\u003e\n\u003cli data-section-id=\"ob37sd\" data-start=\"1453\" data-end=\"1578\"\u003eIncreased transmission (about +2.5% vs prior coating), with \u003cstrong data-start=\"1515\" data-end=\"1531\"\u003e~92% average\u003c\/strong\u003e across the batch and \u003cstrong data-start=\"1553\" data-end=\"1576\"\u003eno filter below 90%\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"686y5a\" data-start=\"1579\" data-end=\"1718\"\u003eBest performance on \u003cstrong data-start=\"1601\" data-end=\"1620\"\u003ef\/3.5 or slower\u003c\/strong\u003e optics\n\u003cul data-start=\"1632\" data-end=\"1718\"\u003e\n\u003cli data-section-id=\"1hwlf0e\" data-start=\"1632\" data-end=\"1718\"\u003eFaster than f\/3.5 can still work, but with reduced contrast and possible artifacts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"18otcz2\" data-start=\"1719\" data-end=\"1974\"\u003ePremium substrate and cell for flatness and mechanical stability\n\u003cul data-start=\"1790\" data-end=\"1974\"\u003e\n\u003cli data-section-id=\"desjvt\" data-start=\"1790\" data-end=\"1898\"\u003e\n\u003cstrong data-start=\"1792\" data-end=\"1819\"\u003eUltra-flat quartz glass\u003c\/strong\u003e in a precision CNC machined cell (strain-free mounting, minimizes tilt risk)\u003c\/li\u003e\n\u003cli data-section-id=\"1w787xu\" data-start=\"1901\" data-end=\"1974\"\u003e\n\u003cstrong data-start=\"1903\" data-end=\"1925\"\u003eSiO2 hard overcoat\u003c\/strong\u003e for easier cleaning with common optical cleaners\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch1 data-section-id=\"1spgaq0\" data-start=\"1976\" data-end=\"1992\"\u003eSpecifications\u003c\/h1\u003e\n\u003cul data-start=\"1993\" data-end=\"2825\"\u003e\n\u003cli data-section-id=\"1qv5hf\" data-start=\"1993\" data-end=\"2044\"\u003e\n\u003cstrong data-start=\"1995\" data-end=\"2011\"\u003eFilter type:\u003c\/strong\u003e Narrowband HSO set (3 filters)\u003c\/li\u003e\n\u003cli data-section-id=\"14keyuj\" data-start=\"2045\" data-end=\"2073\"\u003e\n\u003cstrong data-start=\"2047\" data-end=\"2056\"\u003eSize:\u003c\/strong\u003e \u003cstrong data-start=\"2057\" data-end=\"2071\"\u003e2\" mounted\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1q7k2qe\" data-start=\"2074\" data-end=\"2095\"\u003e\n\u003cstrong data-start=\"2076\" data-end=\"2085\"\u003eFWHM:\u003c\/strong\u003e \u003cstrong data-start=\"2086\" data-end=\"2093\"\u003e3nm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1m39k1c\" data-start=\"2096\" data-end=\"2135\"\u003e\n\u003cstrong data-start=\"2098\" data-end=\"2123\"\u003eCWL \/ FWHM tolerance:\u003c\/strong\u003e \u003cstrong data-start=\"2124\" data-end=\"2133\"\u003e0.5nm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"w8bhqj\" data-start=\"2136\" data-end=\"2217\"\u003e\n\u003cstrong data-start=\"2138\" data-end=\"2175\"\u003eTransmission (target wavelength):\u003c\/strong\u003e approx. \u003cstrong data-start=\"2184\" data-end=\"2191\"\u003e95%\u003c\/strong\u003e (± \u003cstrong data-start=\"2195\" data-end=\"2201\"\u003e3%\u003c\/strong\u003e across batch)\u003c\/li\u003e\n\u003cli data-section-id=\"m47f0g\" data-start=\"2218\" data-end=\"2285\"\u003e\n\u003cstrong data-start=\"2220\" data-end=\"2253\"\u003eAverage transmission (batch):\u003c\/strong\u003e ~\u003cstrong data-start=\"2255\" data-end=\"2262\"\u003e92%\u003c\/strong\u003e; \u003cstrong data-start=\"2264\" data-end=\"2283\"\u003eno filter \u0026lt; 90%\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"198nw32\" data-start=\"2286\" data-end=\"2364\"\u003e\n\u003cstrong data-start=\"2288\" data-end=\"2301\"\u003eBlocking:\u003c\/strong\u003e \u003cstrong data-start=\"2302\" data-end=\"2309\"\u003eOD7\u003c\/strong\u003e average from \u003cstrong data-start=\"2323\" data-end=\"2342\"\u003e200nm to 1100nm\u003c\/strong\u003e (~0.00001% leakage)\u003c\/li\u003e\n\u003cli data-section-id=\"1iuyl4o\" data-start=\"2365\" data-end=\"2431\"\u003e\n\u003cstrong data-start=\"2367\" data-end=\"2380\"\u003eCoatings:\u003c\/strong\u003e V3R anti-reflection \/ anti-halo + UV\/IR blocking\u003c\/li\u003e\n\u003cli data-section-id=\"7dsxqk\" data-start=\"2432\" data-end=\"2478\"\u003e\n\u003cstrong data-start=\"2434\" data-end=\"2448\"\u003eSubstrate:\u003c\/strong\u003e Ultra-flat \u003cstrong data-start=\"2460\" data-end=\"2476\"\u003equartz glass\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"62caos\" data-start=\"2479\" data-end=\"2514\"\u003e\n\u003cstrong data-start=\"2481\" data-end=\"2501\"\u003eGlass thickness:\u003c\/strong\u003e \u003cstrong data-start=\"2502\" data-end=\"2512\"\u003e1.85mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"nxv2ix\" data-start=\"2515\" data-end=\"2545\"\u003e\n\u003cstrong data-start=\"2517\" data-end=\"2530\"\u003eFlatness:\u003c\/strong\u003e \u003cstrong data-start=\"2531\" data-end=\"2543\"\u003e1\/4 wave\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"pa41fi\" data-start=\"2546\" data-end=\"2585\"\u003e\n\u003cstrong data-start=\"2548\" data-end=\"2564\"\u003eParallelism:\u003c\/strong\u003e \u003cstrong data-start=\"2565\" data-end=\"2583\"\u003e30 arc seconds\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"24dv57\" data-start=\"2586\" data-end=\"2649\"\u003e\n\u003cstrong data-start=\"2588\" data-end=\"2597\"\u003eCell:\u003c\/strong\u003e Precision \u003cstrong data-start=\"2608\" data-end=\"2624\"\u003eCNC machined\u003c\/strong\u003e (strain-free mounting)\u003c\/li\u003e\n\u003cli data-section-id=\"rqx0re\" data-start=\"2650\" data-end=\"2714\"\u003e\n\u003cstrong data-start=\"2652\" data-end=\"2665\"\u003eOvercoat:\u003c\/strong\u003e \u003cstrong data-start=\"2666\" data-end=\"2674\"\u003eSiO2\u003c\/strong\u003e tough overcoating (cleaning-friendly)\u003c\/li\u003e\n\u003cli data-section-id=\"8lla8i\" data-start=\"2715\" data-end=\"2825\"\u003e\n\u003cstrong data-start=\"2717\" data-end=\"2746\"\u003eRecommended optics speed:\u003c\/strong\u003e \u003cstrong data-start=\"2747\" data-end=\"2766\"\u003ef\/3.5 or slower\u003c\/strong\u003e (faster systems may reduce contrast \/ introduce artifacts)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch1 data-section-id=\"1hj4hv6\" data-start=\"2827\" data-end=\"2847\"\u003eWhat’s in the box?\u003c\/h1\u003e\n\u003cul data-start=\"2848\" data-end=\"3001\"\u003e\n\u003cli data-section-id=\"1l80brh\" data-start=\"2848\" data-end=\"2925\"\u003eAltair ColourPRO ULTRA \u003cstrong data-start=\"2873\" data-end=\"2884\"\u003e3nm HSO\u003c\/strong\u003e Narrowband Filter Set (2\") — 3 filters\u003c\/li\u003e\n\u003cli data-section-id=\"19nhhq6\" data-start=\"2926\" data-end=\"3001\"\u003e\n\u003cstrong data-start=\"2928\" data-end=\"2985\"\u003eIndividual spectrographic test report for each filter\u003c\/strong\u003e (certification)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch1 data-section-id=\"lm8ipl\" data-start=\"3003\" data-end=\"3022\"\u003eSoftware and Docs\u003c\/h1\u003e\n\u003cul data-start=\"3023\" data-end=\"3161\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\n\u003cli data-section-id=\"o19sqh\" data-start=\"3023\" data-end=\"3085\"\u003eSpectrographic certification reports (included per filter)\u003c\/li\u003e\n\u003cli data-section-id=\"1ywgyof\" data-start=\"3086\" data-end=\"3161\" data-is-last-node=\"\"\u003eNo additional software required (standard filter wheel\/camera compatible)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"z-0 flex min-h-[46px] justify-start\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Altair Astro","offers":[{"title":"Default Title","offer_id":52092649963840,"sku":"F200-3NM-SHO-SET-CP-V3R","price":1049.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/9904\/6464\/files\/altair-colourpro-ultra-3nm-hso-narrowband-filter-set-2-certified-12437-p.jpg?v=1780699655","url":"https:\/\/astroworldtelescopes.com\/products\/altair-colourpro-ultra-3nm-hso-narrowband-filter-set-2-certified","provider":"Astroworld Telescopes","version":"1.0","type":"link"}